A woman found shot to death early Friday was killed in a domestic-related murder-suicide in the Chatham neighborhood, authorities said.

About 12:45 a.m., officers responded to a residence in the 8000 block of South Princeton Avenue and found a 27-year-old woman and a 42-year-old man unresponsive. Both had suffered gunshot wounds, said Chicago Police Department spokeswoman Bari Lemmon.

Lemmon said both victims were pronounced dead at the scene.

The woman was identified as Erica D. Blackman of the same address where she was found, according to the Cook County medical examiner's office. An autopsy revealed Saturday afternoon that Blackman died of a shotgun wound to the left arm. Her death was ruled a homicide, officials said.

The 42-year-old man was pronounced dead on the scene at 1:25 a.m. Friday, according to a medical examiner's office spokesman, and his death from an intra-oral gunshot wound was ruled a suicide following an autopsy Saturday.

Police believe Blackman was killed in a murder-suicide shooting and said the incident was domestic-related. The relationship between Blackman and the man found in the apartment was not released, and the man has not been identified.